Safety mechanism for elevators



Filed March 28, 1933 3 Sheets-'Sheet l Inventor Char-les Maz'er f1 Homey Aug. 29, 1933. c. MAIER .SAFETY MECHANISM FOR ELEVATORS Filed March 28, 1933 3 Sheets-Sheet Inventor Ma er flflorney Aug. 2 9, 1933. c, MAH-:R 1924,506

y -SAFETY MECHANISM FOR ELEVATORS Filed March 28, l1933 5 Sheets-Sheet 5 9 Ivo 20 LVM Char/es Marler* By @mao/32m llorncy nvenlor 'Patented Aug. 29, 1933 e Lifeline,

This invention relates toa nveljmechanical safety device for use'in connection withfeleva'tor cages of the `typerai`s`ed andlowered by a ,central suspension cableorequivalent means.

Briefly stated, the preferredV embodiment" of` the invention utilizes a `doublefor, duplex pivoted Y pawl arrangement-fand atooth'ed `,track rail with which the pawls are automaticallyfengageable` when an emergency arises, such as forexar'np`1e,`

when the suspension cablebreaks, whereby` to check gravitationwor4 descent of the cage and to thereby overcome "serious damage to life and property. Y

I am aware of the fact that the broad propoi 153mm just recited is not a new assembiy-m this e particular line` of endeavor. It follows thatit is Y 'my aim to generally improve upon vsafety appliances and mechanism of thisfclassication by n-providing certain noteworthy refinements and variationsV in selection and adaptation of parts in order to promote moresatisfactory results andl action. j I

In reducing the inventive conception to' actual practice, I have evolved and produced a construction which is efiicient in performance, positiveVv and dependable in action,v simple and economical,

practicable from a manufacturing and commer- ,35' Figure 1 is a view` in section and elevation illustrating the general assembly and disclosing the essential parts in proper particularity. A

Figures 2 and 3 are sectional views taken approximately on the planes of the lines 2 2 and 3-3 respectively of Figure 1. v

Figure 4 is a perspective viewof the pawl actuationspring and attaching clip therefor.` f

Figure 5 is a fragmentary perspective View .showing the coupling means for the special track Vrail.` i j Figure-6 is a top plan view of the structure illustrated in Figure 1. L

Figure 7 is a perspective'view of one of the pawls. Figure 8 is a detailview showing the manner of connecting or coupling two rail sections together. ReferringV nowl to the illustrated drawings wherein the preferredfembodiment of the invention, is ....,disclosed by way `of proper pictorial drawings,'it

' will be observed that the elevator cage is ndicat-vv together-by" jointi'ngor fish plates 12, as illustrated"` l a` clip. `The clip" shown in Figure 4 comprises `upper and lower plates 28 and 29 suitably fashed at in Figure 1, this being of 4any appropri-:r` "ate constructionj-fAttachedf to. `and. rising from v they cage are vertical spaced `parallel, angle i irons lyarranged in proper `pairs tofunctionashrun-V ners, thesebeing Aslidably cooperable vwith thevertical track rails.l Therails are `made up ofV companion rail-` sectionsv 11, .thefrail sections'bef ing f of duplicate `construction andare secured,`

in Figure 8. `llach railsectionisfof-'the construe-.; tion 'shown in Figure 5, from which it will lbe, ob- .i served that it is in the form ofY a metal stamping of appropriate proportion, the same embodyingy spaced parallel side iianges'fl and a connective web fashioned to provideappropriate pawl engaging teeth 14..A i l i Y The numeral l5 in Figure 6 designates a suitable frame to which the runners 10 arebolted or` otherwise fastened. This frame embodies aplurality of angle 'bars` lriveted or otherwisefas-l tened to a'pair of central spaced parallel channelshaped beams `17 to which the hoist andV pawl mechanism is l connected. The hoisting `means `comprises a conventional cable 18 which in accordance with the presentinvention and as shown in Figure 1, is vattached to a ring-19which isin turn secured by,v chains 120 to `duplicate safety pawls 21. r The upper ends of the pawls are formed with eyes 22 to which thechain. links are con-vv nected. The centralportion of` each pawl is enlarged-as indicated at 23 and rockably mounted on a fulcrum bolt 24 carried by the beams `1-7. y

'Ihe lower or working end of the pawlis of V- shaped form, as indicated'at 25 in Figure 7, this. '90"v 1 being the proper shapeto conveniently engage the safety stop teeth 14. A semi-elliptic or correspondingly shaped leaf spring 26 is employed forv actuating the two pawls outwardly under emergency conditions. It lwill be noted that the outer or free end vportions ofthe spring are slightly Y j inturned orV curled, as indicated' at 27.y to provide the requisite cam-'like pressure to ride-thepawls outwardly into engaging position when conditions require. Thespri'ng is vattached to the beams by ioned to embrace the central portion of the spring, thisV clip being secured` to the beams byway of maintenance'bolts-SO, as shownclearly in Figures 1 Vand2.

the perpendicular spaced parallel runners 10 attached to the frame and depending on'opposite cof Thus' it will `he seen `that the structural 165 arrangement is characterized by the frame l5 having the spaced parallel centralizedgbeams 17 and outwardly into engaging relationship with the'i teeth 14. I, therefore, `believethat I have evolved andV produced something which is unequaled in the art and trade and which is practical and Y modern and while not broadly new is a readily recognizable improvement andcontribution to the trade and art to which itrelates. ized by rigidity rand ruggedness andk is otherwise Well suited to perform satisfactorily in the desired capacity.` l

nection with' the drawings will enable a clear understandingof-the invention to be had. Therefore, a more lengthy description is thought unnecessary.l v k j 4 Y While' the'preferred embodiment ofy the invention vhasfbeen shown and described, it is to be Y understood ,thaty minor changes'coming within the 'w'eld of invention claimed Ymay beresorted to if desired.

.of said beams, the lower ends of said pawls being 'arranged ltov automatically engage the teeth of the under emergency conditions, a hoisting cable, 'a vconnection between the cablerand upper ends of It is characterf Y.

H 1,924,5oo

I claim: f V l 1. In a structural arrangement of the class described, a pair of opposed tooth equipped track rails, a framev embodying spaced parallel hoisting beams, pairs of perpendicular parallel guide runners attached to and depending from the frame and slidablyengaged Withthe track rails, a pair of companion pawls pivotally mounted intermediater their ends ladjacent the opposite end portions 1 f 2,` In aV structure of the class described, a travel-r ing framefembodying spaced parallel beams, a pair of duplicate pawls pivotally mounted intermediate their ends between said beams, chains connected to the upperendsof the pawls. a hoisting cable,

.It isthou'ght that the description taken-in con-Vf means Connecting the cable 'with the Chains."

toothed track rails, operating connections betweenv the frame and' track rails, the pawls being ai"- ranged for engagement with the teeth ofthe track rails, a v"single,*longitudinally* bowed flat spring having Vits endjportions formed into cam-like curls engaging` the adjacent end portions ofthe respective pawls, a clipembracing the central portionA of,

the spring, and bolts securing said clip to the 105 'I intermediate portions of'sai'd beams. y

Y CnARLEs MAIER.

iso i VA y SOV 

